US20090095269A1 - Two-Cycle Engine - Google Patents
Two-Cycle Engine Download PDFInfo
- Publication number
- US20090095269A1 US20090095269A1 US11/920,334 US92033406A US2009095269A1 US 20090095269 A1 US20090095269 A1 US 20090095269A1 US 92033406 A US92033406 A US 92033406A US 2009095269 A1 US2009095269 A1 US 2009095269A1
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- United States
- Prior art keywords
- crankcase
- cylinder
- air passage
- passage
- scavenging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/20—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
- F02B25/22—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18 by forming air cushion between charge and combustion residues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/24—Pistons having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0002—Cylinder arrangements
- F02F7/0004—Crankcases of one-cylinder engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
In a stratified scavenging two-cycle engine 1 whose crankshaft 30 is cantilevered, a crankcase 20 is provided with an opening 23 for housing the crankshaft 30, and a thick wall of the crankcase 20 is provided with a crankcase air passage 24. The opening 23 is fitted with a carburetor mount 50 that allows mounting a carburetor 70. Since the carburetor mount 50 covering the opening 23 of the crankcase 20 functions also as an alternative for a conventional insulator, there is no need to prepare a separate insulator, thereby reducing the number of components. Moreover, since the crankcase 20 is lower in temperature than the cylinder 10 in which combustion takes place, the carburetor mount 50 functioning as an insulator can be thinner, thereby downsizing the engine 1.
Description
- The present invention relates to a two-cycle engine, and in particular, to a two-cycle engine which is cantilevered type with a crankshaft supported by a crankcase at only one end of the crankshaft and stratified scavenging type as well.
- A conventional two-cycle engine may be arranged with a crankshaft supported by a crankcase at only one end of the crankshaft.
- Although a cantilevered crankshaft arrangement, only allowing a small displacement, can only be utilized in a small power engine that does not load much on the crankshaft in operation, the arrangement is effective for downsizing an engine.
- A stratified scavenging type is also known as one of the two-cycle engines (e.g., Patent Document 1).
- The stratified scavenging two-cycle engine includes an air passage communicating to a scavenging passage to supply lead air to the scavenging passage before scavenging. The lead air supplied is the first to scavenge combustion gas in a cylinder. While scavenging combustion gas by air-fuel mixture accompanies exhaust of unburned fuel in the air-fuel mixture, the stratified scavenging does not accompany such exhaust, thereby improving fuel efficiency.
- [Patent Document 1] International Publication No. WO98/57053 (
pages 5 to 11) - Since a two-cycle engine with a small displacement is, generally speaking, often used for portable working machinery and the like, a smaller two-cycle engine is desirable. Since an engine is, however, equipped with a carburetor, an insulator and the like for restraining heat transfer to the carburetor, a cantilevered engine is not yet sufficiently compact as a whole with all the attachments, which leaves a strong desire for downsizing the entire engine. Downsizing a stratified scavenging two-cycle engine, prospected to be a mainstream engine of the kind, is especially urgent.
- An object of the present invention is to provide a stratified-scavenging and cantilevered two-cycle engine which contributes toward the downsizing.
- A two-cycle engine according to an aspect of the present invention is a cantilevered stratified scavenging two-cycle engine having a crankshaft supported to a crankcase in a cantilevered manner, including: a scavenging passage provided to a cylinder for communicating a cylinder chamber and an interior portion of the crankcase with each other; a carburetor mount to which a carburetor can be mounted, the carburetor mount covering an opening provided to the crankcase for housing the crankshaft; and an air passage for communicating the scavenging passage and a carburetor mount air passage provided to the carburetor mount for delivering lead air.
- In the above aspect of the invention, since the carburetor mount covering the opening of the crankcase functions also as an alternative for a conventional insulator, there is no need to prepare a separate insulator, thereby reducing the number of components to allow downsizing. Moreover, since the crankcase is lower in temperature than the cylinder in which combustion takes place, the carburetor mount functioning as an insulator can be thinner, thereby securely downsizing the engine. In addition, since the carburetor mount air passage and the scavenging passage are communicated through the air passage, the function as the stratified two-cycle engine can be preserved.
- In the above arrangement, each of the carburetor mount, the crankcase and the cylinder that are integrally assembled may have a thick wall through which the air passage passes to intercommunicate the air passage, the carburetor mount, the crankcase and the cylinder.
- In the aspect of the invention, since the engine is provided with an air passage which communicates passing through thick walls of the cylinder, the crankcase, and the carburetor mount, the air passage can be integrated with the engine without being exposed to the outside of the engine, thereby enabling downsizing.
- In the above arrangement, a portion of the air passage disposed at the thick wall of the crankcase may be formed by a groove provided to one of the crankcase and the cylinder and a wall provided to the other for covering the groove.
- In the above arrangement, a portion of the air passage disposed at the thick wall of the crankcase may be formed by a groove provided to one of the crankcase and the carburetor mount and a wall provided to the other for covering the groove.
- In the aspect of the invention, since at the thick wall of the crankcase, the air passage is formed by a groove provided to any of the crankcase, the cylinder, or the carburetor mount and a wall provided for covering the groove, the structure is simplified as compared to a structure with a penetrating hole through the thick wall, thereby facilitating manufacturing process.
- In the above arrangement, the two-cycle engine may include: a scavenging passage core hole provided as an opening into an outside of the cylinder for forming a scavenging port, the scavenging port being an opening into the cylinder chamber of the scavenging passage; and an air passage core hole provided as an opening into the outside of the cylinder for forming an air intake port, the air intake port being an opening into the cylinder chamber of a portion of the air passage disposed at a thick wall of the air passage; in which the scavenging passage core hole and the air passage core hole are provided adjacent to each other and covered by a singular cover.
- In the above aspect of the invention, since the scavenging passage core hole for forming the scavenging port and the air passage core hole for forming the air intake port are provided to the cylinder adjacent to each other and the core holes are covered by a singular cover, the core holes need not be covered by separate covers, thereby preventing an increase in the number of components.
- In the above arrangement, the air passage may include a tube crawling on outsides of the crankcase and the cylinder.
- In the above aspect of the invention, since the air passage includes a tube crawling on the outsides of the crankcase and the cylinder, the direct communicative connection by the tube of the carburetor mount air passage and the scavenging passage unnecessitates the air passage in the thick wall of the cylinder or the crankcase, thereby simplifying the structure of the air passage to facilitate manufacturing process.
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FIG. 1 shows an exploded perspective of a two-cycle engine according to a first embodiment of the present invention; -
FIG. 2 shows an exploded perspective of the two-cycle engine from another direction; -
FIG. 3 shows a perspective of a cylinder; -
FIG. 4 shows a half sectional perspective of the cylinder; -
FIG. 5 is a perspective of the cylinder inFIG. 4 viewed from inside; -
FIG. 6 shows an exploded perspective of a two-cycle engine according to a second embodiment of the present invention; -
FIG. 7 shows an exploded perspective of a two-cycle engine according to a third embodiment of the present invention; -
FIG. 8 shows an exploded perspective of a two-cycle engine according to a fourth embodiment of the present invention; and -
FIG. 9 shows an exploded perspective of a two-cycle engine according to a fifth embodiment of the present invention. - 1 . . . two-cycle engine, 4 . . . air passage, 10 . . . cylinder, 13 . . . scavenging passage, 18 . . . air passage core hole, 20 . . . crankcase, 23 . . . opening, 30 . . . crankshaft, 50 . . . carburetor mount, 54 . . . carburetor mount air passage, 58
. . . tube - A first embodiment of the present invention will be described below with reference to the drawings.
-
FIG. 1 shows an exploded perspective of a stratified scavenging two-cycle engine 1 according to the embodiment.FIG. 2 shows an exploded perspective of the two-cycle engine 1 viewed from another direction. - As shown in
FIGS. 1 and 2 , the stratified scavenging two-cycle engine 1 includes: acylinder 10 having a cooling fin; acrankcase 20 provided under the cylinder 10 (in the Figures); acrankshaft 30 placed in thecrankcase 20 and supported only at one end of the crankshaft; apiston 40 connected to thecrankshaft 30 via thecylinder 10 and slidably inserted in thecylinder 10; and acarburetor mount 50 attached to thecrankcase 20 at an opposite side of the crankcase with respect to the side to which thecrankshaft 30 is supported. Acarburetor 70 is mounted to thecarburetor mount 50. -
FIG. 3 is a perspective of thecylinder 10.FIG. 4 is a half sectional perspective of thecylinder 10.FIG. 5 is a perspective of thecylinder 10 ofFIG. 4 viewed from inside. - As shown in
FIG. 3 , thecylinder 10 includes: aconnection surface 17 for connection with the crankcase 20 (FIGS. 1 and 2 ); aliner 11 projecting from theconnection surface 17; ascavenging passage 13 which has two divided openings around theliner 11; a pair ofcylinder air passages 14 which also have openings around theliner 11; acylinder mixture passage 15 which has still another opening around theliner 11; and anexhaust passage 16 which opens on the inner surface of thecylinder 10 to form anexhaust port 160 as shown inFIG. 5 . Anothercylinder air passage 14 is also provided at radially opposed position around thecylinder 10, which is not shown behind theliner 11 inFIG. 3 . - In
FIGS. 3 to 5 , thescavenging passage 13 opens on the inner surface of thecylinder 10 to form ascavenging port 130 and diverges to open to the outside of thecylinder 10 to form a scavengingpassage core hole 131. The scavengingpassage core hole 131 is a hole used for a core when thescavenging port 130 is formed. - The
cylinder air passage 14 opens on the inner surface of thecylinder 10 to form anair intake port 140. Thecylinder air passage 14 diverges to open to the outside of thecylinder 10 to form an airpassage core hole 18. The airpassage core hole 18 is a hole used for a core when theair intake port 140 is formed. - The
cylinder mixture passage 15 opens on the inner surface of thecylinder 10 to form amixture intake port 150. Theengine 1 in the present embodiment is of the piston valve type in which themixture intake port 150 opens and closes by the reciprocal movement of thepiston 40. The cylinder mixture passage 15 diverges to open to the outside of thecylinder 10 to form a mixturepassage core hole 19. The mixture passagecore hole 19 is also a hole used for a core when themixture intake port 150 is formed. - On a first side of the
cylinder 10, acover 60A covers the airpassage core hole 18, the mixture passagecore hole 19 and the scavengingpassage core hole 131. On a second side of thecylinder 10, as shown inFIG. 2 , the airpassage core hole 18 in communication with theair intake port 140 is the only hole provided adjacent to the scavengingpassage core hole 131, and the airpassage core hole 18 and the scavengingpassage core hole 131 are covered by acover 60B. This is because the inner surface of the second side of thecylinder 10 is only provided with thescavenging port 130 and theair intake port 140 and not provided with themixture intake port 150, the cylinder mixture passage 15 in communication with themixture intake port 150, and the mixture passagecore hole 19. - Although the unconventional core holes 18 and 19 are provided on the first side of the
cylinder 10 in the embodiment, since the core holes 18 and 19 are provided adjacent to the scavengingpassage core hole 131 with the scavengingcore hole 131 in between, the core holes 18 and 19 and the conventional scavengingpassage core hole 131 can be covered by asingular cover 60A, so that there is no need for a dedicated cover for each of the holes, thereby preventing an increase in the number of components. On the second side of thecylinder 10, since the airpassage core hole 18 is also provided adjacent to the scavengingpassage core hole 131, the airpassage core hole 18 and the scavengingpassage core hole 131 can be covered by asingular cover 60B, thereby preventing an increase in the number of components. - An
opening 23 of thecrankcase 20, provided to aconnection surface 22 that connects with thecarburetor mount 50, is sized so as to house thecrankshaft 30 therein in assembling theengine 1. After thecrankshaft 30 is placed in thecrankcase 20, theopening 23 is covered by fitting aprojection 51 projecting from thecarburetor mount 50. Anopening 27 of thecrankcase 20, provided to aconnection surface 26 that connects with thecylinder 10, is fitted with a lower end of theliner 11 of thecylinder 10. Thecrankcase 20 arranged as such is further provided with acrankcase air passage 24 and acrankcase mixture passage 25, which open around theopenings crankcase air passage 24 opening on theconnection surface 26 communicates with thecylinder air passage 14, and the opening of the crankcasemixture air passage 25 on theconnection surface 26 communicates with thecylinder mixture passage 15. In addition, theconnection surface 26 is provided withrecesses passage 13 of thecylinder 10. - The
piston 40 is provided with a pair ofconduits 41 around the outer circumference thereof. As shown inFIGS. 1 and 5 (two dot phantom), theconduits 41 are sized so as to extend from theair intake port 140 to the scavengingport 130 and allow theports - The
carburetor mount 50, as shown inFIG. 2 , includes; theprojection 51; anexterior frame 52 which serves as an air cleaner case; an insulatingportion 53 to which thecarburetor 70 is attached for restraining heat transfer from theengine 1 to thecarburetor 70; a carburetormount air passage 54; and a carburetormount mixture passage 55. - As shown in
FIG. 2 , the carburetormount air passage 54 is formed along the axis of thecrankcase air passage 24 and is communicatively connected with thecrankcase air passage 24. The carburetormount mixture passage 55 curves in thecarburetor mount 50, and opens on theconnection surface 56, which is a surface in connection with the crankcase, at a position that corresponds to the opening of thecrankcase mixture passage 25. - In the present embodiment, eventually, an
air passage 4 includes the carburetormount air passage 54, thecrankcase air passage 24, thecylinder air passage 14 and theconduit 41 of thepiston 40, and amixture passage 5 includes the carburetormount mixture passage 55, thecrankcase mixture passage 25 and thecylinder mixture passage 15. It should be appreciated that theair passage 4 and themixture passage 5 exploit thick walls of thecylinder 10, thecrankcase 20 and thepiston 40 and even penetrate the thick walls of thecylinder 10 and thecrankcase 20 - As described above, since the
engine 1 is provided with thepassages cylinder 10 and thecrankcase 20, lead air and mixture can securely be supplied from thecarburetor 70 mounted to thecarburetor mount 50. In addition, since thecarburetor mount 50 covering theopening 23 of thecrankcase 20 functions also as an alternative for a conventional insulator, there is no need to prepare a separate insulator, thereby reducing the number of components. Moreover, since the temperature of thecrankcase 20 is lower than that of thecylinder 10 where combustion takes place, thecarburetor mount 50 functioning as an insulator can be thinner, thereby enabling downsizing theengine 1. - The movement of the
engine 1 will be described below. - In the stratified scavenging two-
cycle engine 1 arranged as described above, when thepiston 40 moves from the bottom dead center toward the top dead center, the pressure starts to decrease in the crank chamber and increase in the cylinder chamber, and the scavengingport 130 and theexhaust port 160, opening into the cylinder chamber, close in sequence. While theair intake port 140 moves to the top dead center, theair intake port 140 acquire communication to the scavengingport 130 via theconduit 41 of thepiston 40, and in thecrankcase 20 themixture intake port 150 opens to acquire communication to the crank chamber. As a consequence, scavenging lead air flows through theair passage 14, theair intake port 140 and theconduit 41 and intrudes into a portion of the scavengingpassage 13, adjacent with respect to the scavengingport 130. The mixture flows through themixture passage 5 to themixture intake port 150, where the mixture is introduced into the crank chamber. - When the
piston 40 ascends further and reaches the top dead center, the mixture in thecylinder 10 is ignited and combusted, and the resultant explosion causes thepiston 40 to descend. Accordingly, the pressure starts to rise in the crank chamber. Besides, themixture intake port 150 is closed by thepiston 40 to discommunicate the scavengingport 130 and theair intake port 140 from each other. - As the
piston 40 descends, theexhaust port 160 and the scavengingport 130 open into the cylinder chamber in sequence, so that, while combustion gas is exhausted through theexhaust port 160, the lead air staying in the scavengingpassage 13 flows into the cylinder chamber by the increased pressure in the crank chamber to crowd out the residual combustion gas in thecylinder 10 through theexhaust port 160. Subsequently, the mixture in the crank chamber flows into the cylinder chamber through the recess 28 and the scavengingpassage 13. Thepiston 40 then again starts to ascend from the bottom dead center, causing the pressure in the crank chamber to fall, the scavengingport 130 and theexhaust port 160 to close in sequence, and the above-described cycle to repeat. -
FIG. 6 shows an exploded perspective of a two-cycle engine according to a second embodiment of the present invention. In the following description, the same members and functional portions as those of the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted or simplified. - In the present embodiment, the
mixture passage 5 opens directly into the crank chamber from theprojection 51 of thecarburetor mount 50, unlike in the first embodiment. In other words, themixture passage 5 of the present embodiment is constituted only by the carburetormount mixture passage 55. Theprojection 51 of thecarburetor mount 50 is provided with alead valve 57 for opening and closing the carburetormount mixture passage 55. Only during compression stroke thelead valve 57 opens by the negative pressure in the crankcase to introduce mixture into thecrankcase 20. In short, theengine 1 in the present embodiment is lead valve type. - The present embodiment has an arrangement similar to the first embodiment, so that similar effects can be obtained. In addition, since the
mixture passage 5 directly communicates with the crank chamber from thecarburetor mount 50, thecylinder mixture passage 15 and thecrankcase mixture passage 25 found in the first embodiment need not be provided to thecylinder 10 and thecrankcase 20. As a result, the structure of thecrankcase 20 can be simplified, pressure loss can be eliminated in themixture passage 5, and the operation of theengine 1 can be stabilized. -
FIG. 7 shows an exploded perspective of a two-cycle engine according to a third embodiment of the present invention. In theengine 1 of the embodiment, the portions of theair passage 4 and themixture passage 5 passing through the thick wall of thecrankcase 20 are formed tunnel-like by grooves opening on theconnection surface 26 and a groove-covering wall residing on theconnection surface 17 of thecylinder 10. These tunnel-like portions are identified as thecrankcase air passage 24 and thecrankcase mixture passage 25. - The present embodiment can still have effects similar to the first embodiment since the
passages carburetor mount 50 can be communicatively connected with thepassages -
FIG. 8 shows an exploded perspective of a two-cycle engine according to a fourth embodiment of the present invention. In theengine 1 of the embodiment, the portion of theair passage 4 passing through the thick wall of thecrankcase 20 is formed by a groove on thecarburetor mount 50 and a groove-covering wall on thecrankcase 20. The groove of thecarburetor mount 50 is opening on aconnection surface 56 that connects with thecrankcase 20. The flange-shaped groove-covering wall of thecrankcase 20 is formed around theopening 23. - The present embodiment can still have an arrangement and effects similar to the first embodiment since the groove on the
carburetor mount 50 is covered by the groove-covering wall of thecrankcase 20 so as to be tunnel-like. -
FIG. 9 shows an exploded perspective of a two-cycle engine according to a fifth embodiment of the present invention. Theengine 1 of the embodiment is the lead valve type, and moreover, is provided with atube 58, which extends through anexterior frame 52 of thecarburetor mount 50 and thecovers cylinder 10 and provides direct communicative connection between the carburetormount air passage 54 and the scavengingpassage 13. In other words, thetube 58 branches off in the middle to send to the scavengingpassages 13 the lead air coming from thecarburetor air passage 54. - The present embodiment can still have an arrangement and effects similar to the first embodiment. In addition, since the carburetor
mount air passage 54 directly communicates with the scavengingpassage 13 via thetube 58, air passages need not be provided to the thick walls of thecrankcase 20 and thecylinder 10, whereby the simplified structure of theair passage 4 facilitates manufacturing process. - It should be understood that the present invention be not limited to the above embodiments, but various modifications and improvements can be made insofar as an object of the present invention is achieved.
- For example, while the
tube 58 is connected to thecarburetor mount 50 and thecovers mount air passage 54 and the scavengingpassage 13 in the fifth embodiment, thetube 58 may be implemented in any suitable manner, such as connecting thecrankcase 20 to the cover 60 so as to communicate thecrankcase air passage 24 with the scavengingpassage 13 or connecting thecarburetor mount 50 to thecylinder 10 so as to communicate the carburetormount air passage 54 to thecylinder air passage 14. - The present invention can be used for blowers, brushcutters, chainsaws and other portable work machinery as a stratified scavenging two-cycle engine whose crankshaft is supported by a crankcase at only one end of the crankshaft.
Claims (6)
1. A cantilevered stratified scavenging two-cycle engine having a crankshaft supported to a crankcase in a cantilevered manner, comprising:
a scavenging passage provided to a cylinder for communicating a cylinder chamber and an interior portion of the crankcase with each other;
a carburetor mount to which a carburetor can be mounted, the carburetor mount covering an opening provided to the crankcase for housing the crankshaft; and
an air passage for communicating the scavenging passage and a carburetor mount air passage provided to the carburetor mount for delivering lead air.
2. The two-cycle engine according to claim 1 , wherein each of the carburetor mount, the crankcase and the cylinder that are integrally assembled has a thick wall through which the air passage passes to intercommunicate the air passage, the carburetor mount, the crankcase and the cylinder.
3. The two-cycle engine according to claim 2 , wherein a portion of the air passage disposed at the thick wall of the crankcase is formed by a groove provided to one of the crankcase and the cylinder and a wall provided to the other for covering the groove.
4. The two-cycle engine according to claim 2 , wherein a portion of the air passage disposed at the thick wall of the crankcase is formed by a groove provided to one of the crankcase and the carburetor mount and a wall provided to the other for covering the groove.
5. The two-cycle engine according to claim 1 , further comprising: a scavenging passage core hole provided as an opening into an outside of the cylinder for forming a scavenging port;
the scavenging port being an opening into the cylinder chamber of the scavenging passage; and
an air passage core hole provided as an opening into the outside of the cylinder for forming an air intake port, the air intake port being an opening into the cylinder chamber of a portion of the air passage disposed at a thick wall of the air passage; wherein
the scavenging passage core hole and the air passage core hole are provided adjacent to each other and covered by a singular cover.
6. The two-cycle engine according to claim 1 , wherein the air passage is provided with a tube crawling on outsides of the crankcase and the cylinder.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2005380258A JP2007177774A (en) | 2005-12-28 | 2005-12-28 | Two-cycle engine |
JP2005-380258 | 2005-12-28 | ||
PCT/JP2006/325916 WO2007077826A1 (en) | 2005-12-28 | 2006-12-26 | Two-cycle engine |
Publications (1)
Publication Number | Publication Date |
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US20090095269A1 true US20090095269A1 (en) | 2009-04-16 |
Family
ID=38228179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/920,334 Abandoned US20090095269A1 (en) | 2005-12-28 | 2006-12-26 | Two-Cycle Engine |
Country Status (5)
Country | Link |
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US (1) | US20090095269A1 (en) |
EP (1) | EP1967722A1 (en) |
JP (1) | JP2007177774A (en) |
CN (1) | CN101175911B (en) |
WO (1) | WO2007077826A1 (en) |
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US20090038106A1 (en) * | 2007-08-10 | 2009-02-12 | Zenoah Co., Ltd. | Engine blower |
US20090100689A1 (en) * | 2005-12-28 | 2009-04-23 | Kouichi Shimokawa | Chain saw |
US20090100688A1 (en) * | 2005-11-15 | 2009-04-23 | Husqvarna Zenoah Co., Ltd. | Chainsaw |
US20090126147A1 (en) * | 2006-10-20 | 2009-05-21 | Husqvarna Zenoah Co. Ltd. | Blower duct |
US20110308507A1 (en) * | 2010-06-22 | 2011-12-22 | Tsuneyoshi Yuasa | Two-stroke cycle combustion engine of air scavenging type |
US20120073537A1 (en) * | 2010-09-23 | 2012-03-29 | Polaris Industries Inc. | Engine |
EP2497932A1 (en) * | 2011-03-09 | 2012-09-12 | Makita Corporation | Two-stroke engine with a silencer |
US20170204779A1 (en) * | 2016-01-16 | 2017-07-20 | Zhejiang Zomax Garden Machinery Co., Ltd. | Low-Emission Cylinder with External Scavenging Duct |
US11041432B1 (en) * | 2020-09-22 | 2021-06-22 | Chun-Li Chen | Cylinder structure of internal combustion engine |
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JP5054502B2 (en) * | 2007-12-14 | 2012-10-24 | ハスクバーナ・ゼノア株式会社 | Scavenging cover and 2-cycle engine |
JP5024230B2 (en) * | 2008-08-12 | 2012-09-12 | 日立工機株式会社 | Stratified scavenging two-cycle engine and two-cycle engine tool |
JP5370669B2 (en) * | 2009-10-07 | 2013-12-18 | 株式会社やまびこ | 2-cycle engine |
DE102010045332B4 (en) * | 2010-09-14 | 2021-12-02 | Andreas Stihl Ag & Co. Kg | Cylinder for an internal combustion engine and process for its manufacture |
JP2012107552A (en) * | 2010-11-16 | 2012-06-07 | Husqvarna Zenoah Co Ltd | Stratified scavenging two-stroke engine |
WO2012104919A1 (en) * | 2011-02-03 | 2012-08-09 | Husqvarna Zenoah Co., Ltd. | Stratified scavenging two-stroke engine |
CN106285995B (en) * | 2016-10-08 | 2018-09-25 | 山东华盛农业药械有限责任公司 | Two stroke engine enclosed scavenging access |
JPWO2021177010A1 (en) * | 2020-03-02 | 2021-09-10 |
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090100688A1 (en) * | 2005-11-15 | 2009-04-23 | Husqvarna Zenoah Co., Ltd. | Chainsaw |
US7946040B2 (en) | 2005-11-15 | 2011-05-24 | Husqvarna Zenoah Co., Ltd. | Chainsaw |
US20090100689A1 (en) * | 2005-12-28 | 2009-04-23 | Kouichi Shimokawa | Chain saw |
US20090126147A1 (en) * | 2006-10-20 | 2009-05-21 | Husqvarna Zenoah Co. Ltd. | Blower duct |
US20090038106A1 (en) * | 2007-08-10 | 2009-02-12 | Zenoah Co., Ltd. | Engine blower |
US8726859B2 (en) * | 2010-06-22 | 2014-05-20 | Kawasaki Jukogyo Kabushiki Kaisha | Two-stroke cycle combustion engine of air scavenging type |
US20110308507A1 (en) * | 2010-06-22 | 2011-12-22 | Tsuneyoshi Yuasa | Two-stroke cycle combustion engine of air scavenging type |
US20120073537A1 (en) * | 2010-09-23 | 2012-03-29 | Polaris Industries Inc. | Engine |
US9719463B2 (en) | 2010-09-23 | 2017-08-01 | Polaris Industries Inc. | Engine |
US10294889B2 (en) * | 2010-09-23 | 2019-05-21 | Polaris Industries Inc. | Engine |
EP2497932A1 (en) * | 2011-03-09 | 2012-09-12 | Makita Corporation | Two-stroke engine with a silencer |
US20170204779A1 (en) * | 2016-01-16 | 2017-07-20 | Zhejiang Zomax Garden Machinery Co., Ltd. | Low-Emission Cylinder with External Scavenging Duct |
US10145293B2 (en) * | 2016-01-16 | 2018-12-04 | Zhejiang Zomax Garden Machinery Co., Ltd. | Low-emission cylinder with external scavenging duct |
US11041432B1 (en) * | 2020-09-22 | 2021-06-22 | Chun-Li Chen | Cylinder structure of internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
CN101175911B (en) | 2011-12-07 |
CN101175911A (en) | 2008-05-07 |
EP1967722A1 (en) | 2008-09-10 |
JP2007177774A (en) | 2007-07-12 |
WO2007077826A1 (en) | 2007-07-12 |
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Owner name: ZENOAH CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ZAMA, RYOUJI;REEL/FRAME:020148/0298 Effective date: 20071028 |
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